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Published in Crop Sci 13:591-594 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Cytogenetics of a Crown Rust-Resistant Hexaploid Oat with 42 + 2 Fragment Chromosomes1

A. Dherawattana and K. Sadanaga2

Twenty-two bivalents were observed in XII7 oat (Avena saliva L.), a isogenic line resistant to crown rust (Puccinia coronata Cda. avenae Eraser and Led.), and with 42 + 2 fragment chromosomes. The homologous fragment chromosomes are either telocentric or acrocentric. Transmission through the egg, calculated from the backcross data, was 18.2%. A dominant gene, Pc-15, conferring resistance to races 264 and 290 of crown rust of oats is located on each of the fragments.

Key Words: Aneuploid • Avena sp. • Interspecific hybridization • Meiosis • Telocentric • Transmission

1 1 Cooperative investigations of Plant Science Research Division, Agricultural Research Service, USDA, and Iowa Agriculture and Home Economics Experiment Station. Journal Paper No. J-7146 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1752. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree at Iowa State University.

2 Former Graduate Student, and Research Geneticist, Plant Science Research Division, ARS, USDA, respectively.

Received for publication January 11, 1973.


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